<div class="refentry" title="glStencilMask"><a id="glStencilMask"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>glStencilMask — control the writing of individual bits in the
        stencil planes</p></div><div class="refsynopsisdiv" title="C Specification"><h2>C Specification</h2><div class="funcsynopsis"><table class="funcprototype-table"><tr><td><code class="funcdef">void <b class="fsfunc">glStencilMask</b>(</code></td><td>GLuint <var class="pdparam">mask</var><code>)</code>;</td></tr></table><div class="funcprototype-spacer"> </div></div></div><div class="refsect1" title="Parameters"><a id="parameters"></a><h2>Parameters</h2><div class="variablelist"><dl><dt><span class="term">
                    <em class="parameter"><code>mask</code></em>
                </span></dt><dd><p>Specifies a bit mask to enable and disable writing
                    of individual bits in the stencil planes. The initial value
                    is all 1's.</p></dd></dl></div></div><div class="refsect1" title="Description"><a id="description"></a><h2>Description</h2><p><code class="function">glStencilMask</code>
        controls the writing of individual bits in the stencil planes.
        The least significant <em class="replaceable"><code>n</code></em>
        bits of <em class="parameter"><code>mask</code></em>, where
        <em class="replaceable"><code>n</code></em>
        is the number of bits in the stencil buffer, specify a mask.
        Where a 1 appears in the mask, it's possible to write to the
        corresponding bit in the stencil buffer. Where a 0 appears, the
        corresponding bit is write-protected. Initially, all bits are
        enabled for writing.</p></div><div class="refsect1" title="Associated Gets"><a id="associatedgets"></a><h2>Associated Gets</h2><p>
        <a class="citerefentry" href="glGet"><span class="citerefentry"><span class="refentrytitle">glGet</span></span></a>
        with argument <code class="constant">GL_STENCIL_WRITEMASK</code> or
        <code class="constant">GL_STENCIL_BITS</code>
        </p></div><div class="refsect1" title="See Also"><a id="seealso"></a><h2>See Also</h2><p>
        <a class="citerefentry" href="glClear"><span class="citerefentry"><span class="refentrytitle">glClear</span></span></a>,
        <a class="citerefentry" href="glColorMask"><span class="citerefentry"><span class="refentrytitle">glColorMask</span></span></a>,
        <a class="citerefentry" href="glDepthMask"><span class="citerefentry"><span class="refentrytitle">glDepthMask</span></span></a>,
        <a class="citerefentry" href="glGet"><span class="citerefentry"><span class="refentrytitle">glGet</span></span></a>,
        <a class="citerefentry" href="glStencilFunc"><span class="citerefentry"><span class="refentrytitle">glStencilFunc</span></span></a>,
        <a class="citerefentry" href="glStencilOp"><span class="citerefentry"><span class="refentrytitle">glStencilOp</span></span></a>
        </p></div><div class="refsect1" title="Copyright"><a id="copyright"></a><h2>Copyright</h2><p>
            Copyright © 2003-2004
            Silicon Graphics, Inc. This document is licensed under the SGI
            Free Software B License. For details, see
            <a class="ulink" href="https://web.archive.org/web/20171022161616/http://oss.sgi.com/projects/FreeB/" target="_top">https://web.archive.org/web/20171022161616/http://oss.sgi.com/projects/FreeB/</a>.
        </p></div></div>
